SW8970936_HISTORICAL FILE_19980113

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
SW8 q lOg3lu
DOC TYPE
❑ CURRENT PERMIT
❑ APPROVED PLANS
�] HISTORICAL FILE
❑ COMPLIANCE EVALUATION INSPECTION
DOC DATE
11ia od O I 1,5
YYYYMMDD

State of North Carolina
Department of Environment
and Natural Resources
Wilmington Regional Office
James B. Hunt, Jr., Governor
Wayne McDevitt, Secretary
Division of Water Quality
January 13, 1998
Mr. John Sabitini, President
Clear Water Place, Inc.
PO Box 6059
South Brunswick, NC 28470
STUN;Wor
•
NCl.®ENR
NORTH CAROLINA DEPARTMENT OF
ENVIRONMENT AND NATURAL RESOURCES
Subject: Permit No. SW8 970936
Clear Water Place @Winding River Plantation
High Density Commercial Stormwater Project
Brunswick County
Dear Mr. Sabitini:
The Wilmington Regional Office received the Stormwater Management Permit Application for Clear Water Place
@Winding River Plantation on September 26, 1997, with final information on November 13, 1997. Staff review of the
plans and specifications has determined that the project, as proposed, will comply with the Stormwater Regulations set forth
in Title 15A NCAC 2H.1000. We are forwarding Permit No. SW8 970936 dated January 13, 1998, for the construction
of Clear Water Place @Winding River Plantation.
This permit shall be effective from the date of issuance until January 13, 2008, and shall be subject to the conditions and
limitations as specified therein. Please pay special attention to the Operation and Maintenance requirements in this permit.
Failure to establish an adequate system for operation and maintenance of the stormwater management system will result
in future compliance problems.
If any parts, requirements, or limitations contained in this permit are unacceptable, you have the right to request an
adjudicatory hearing upon written request within thirty (30) days following receipt of this permit. This request must be
in the form of a written petition, conforming to Chapter 150B of the North Carolina General Statutes, and filed with the
Office of Administrative Hearings, P.O. Drawer 27447, Raleigh, NC 27611-7447. Unless such demands are made this
permit shall be final and binding.
If you have any questions, or need additional information concerning this matter, please contact Linda Lewis, or me at
[phone].
Sincerely,
k—)—l'C� S(� I\,fti
Rick Shiver, P.G.
Acting Regional Water Quality Supervisor
RSS/arl: S:\WQS\STORMWAT\PERMIT\970936.JAN
cc: Jay Houston, P.E.
Delaney Aycock, Brunswick County Inspections
Linda Lewis
Wilms mington-Regional-Office
Central Files
127 North Cardinal Dr., Wilmington, North Carolina 28405 Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer 50% recycled/10 % post -consumer paper

}
State Stormwater Management Systems
Permit No. SW8 970936
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
STATE STORMWATER MANAGEMENT PERMIT
HIGH DENSITY DEVELOPMENT
In accordance with the provisions of Article 21 of Chapter 143, General Statutes of North Carolina as amended, and other
applicable Laws, Rules, and Regulations
PERMISSION IS HEREBY GRANTED TO
Clear Water Place, Inc.
Clear Water Place @Winding River Plantation
Brunswick County
FOR THE
.construction, operation and maintenance of a detention pond in compliance with the provisions of 15A NCAC 2H .1000
(hereafter referred to as the "stormwater rules") and the approved stormwater management plans and specifications and
other supporting data as attached and on file with and approved by the Division of Water Quality and considered a part of
this permit.
This permit shall be effective from the date of issuance until January 13, 2008 and shall be subject to the following specified
conditions and limitations:
I. DESIGN STANDARDS
This permit is effective only with respect to the nature and volume of stormwater described in the application and
other supporting data.
2. This stormwater system has been approved for the management of stormwater runoff as described on page 3 of this
permit, the Project Data Sheet. The stormwater control has been designed to handle the runoff from 222,330 square
feet of impervious area.
3. Approved plans and specifications for this project are incorporated by reference and are enforceable parts of the
permit.
4. The tract will be limited to the amount of built -upon area indicated on page 3 of this permit, and per approved
plans.
Clearwater Place is designated as Tract R on the Master Plan, under permit #SW8 961109.
K,
2

•
State Stormwater Management Systems
Permit No. SW8 270936
DIVISION OF WATER QUALITY
PROJECT DATA SHEET
Project Name:
Clear Water Place @Winding River Plantation
Permit Number:
970936
Location:
Brunswick County
Applicant:
Mr. John Sabitini, President
Mailing Address:
Clear Water Place, Inc.
PO Box 6059
South Brunswick, NC 28470
Application Date:
September 26, 1997
Water Body Receiving Stormwater Runoff:
Lockwoods Folly River
Classification of Water Body:
"SC"
If Class SA, chloride sampling results:
N/A
Pond Depth, feet:
6
Permanent Pool Elevation, FMSL:
20
Total Impervious Surfaces, ft2:
222,330
Buildings 14@6174 ftz:
86,436
Pool and Tennis Courts, ftz:
22,825 (Portion of Amenity Area)
Amenity Building, ftz:
3,167 (Portion of Amenity Area)
Parking, ftz:
98,576
Sidewalk, ft2:
11,326
Offsite Area entering Pond, ft2:
none, per Engineer
Required Surface Area, ftz:
12,479
Provided Surface Area, ftz:
19,150
Required Storage Volume, ft3:
18,281
Provided Storage Volume, ft3:
20,335
Temporary Storage Elevation, FMSL:
21
Controlling Orifice:
2" pipe

State Stormwater Management Systems
Permit No. SW8 970936
The permittee is responsible for verifying that the proposed built -upon area does not exceed the allowable built -
upon area.
The following items will require a modification to the permit:
a. Any revision to the approved plans, regardless of size.
b. Project name change.
C. Transfer of ownership.
d. Redesign or addition to the approved amount of built -upon area.
C. Further subdivision of the project area.
f. Filling in, altering, or piping of any vegetative conveyance shown on the approved plan.
In addition, the Director may determine that other revisions to the project should require a modification to the
permit.
The Director may notify the permittee when the permitted site does not meet one or more of the minimum
requirements of the permit. Within the time frame specified in the notice, the permittee shall submit a written time
schedule to the Director for modifying the site to meet minimum requirements. The permittee shall provide copies
of revised plans and certification in writing to the Director that the changes have been made.
II. SCHEDULE OF COMPLIANCE
1. The permittee will comply with the following schedule for construction and maintenance of the stormwater
management system:
a. The stormwater management system shall be constructed in it's entirety, vegetated and operational for it's
intended use prior to the construction of any built -upon surface except roads.
b. During construction, erosion shall be kept to a minimum and any eroded areas of the system will be
repaired immediately.
2. The permittee shall at all times provide the operation and maintenance necessary to assure the permitted stormwater
system functions at optimum efficiency. The approved Operation and Maintenance Plan must be followed in its
entirety and maintenance must occur at the scheduled intervals including, but not limited to:
a. Semiannual scheduled inspections (every 6 months).
b. Sediment removal.
C. Mowing and revegetation of side slopes.
d. Immediate repair of eroded areas.
e. Maintenance of side slopes in accordance with approved plans and specifications.
f. Debris removal and unclogging of outlet structure, orifice device and catch basins and piping.
g. Access to the outlet structure must be available at all times.
Records of maintenance activities must be kept and made available upon request to authorized personnel of DWQ.
The records will indicate the date, activity, name of person performing the work and what actions were taken.
4. This permit shall become voidable unless the facilities are constructed in accordance with the conditions of this
permit, the approved plans and specifications, and other supporting data.

State Stormwater Management Systems
Permit No. SW8 970936
Upon completion of construction, prior to issuance of a Certificate of Occupancy, and prior to operation of this
permitted facility, a certification must be received from an appropriate designer for the system installed certifying
that the permitted facility has been installed in accordance with this permit, the approved plans and specifications,
and other supporting documentation. Any deviations from the approved plans and specifications must be noted on
the Certification.
A copy of the approved plans and specifications shall be maintained on file by the Permittee for a minimum of ten
years from the date of the completion of construction.
Prior to the sale of any portion of the property, an access/maintenance easement to the stormwater facilities shall
be granted in favor of the permittee if access to the stormwater facilities will be restricted by the sale of any portion
of the property.
III. GENERAL CONDITIONS
1. This permit is not transferable. In the event there is a desire for the facilities to change ownership, or there is a
name change of the Permittee, a formal permit request must be submitted to the Division of Water Quality
accompanied by an application fee, documentation from the parties involved, and other supporting materials as may
be appropriate. The approval of this request will be considered on its merits and may or may not be approved.
2. Failure to abide by the conditions and limitations contained in this permit may subject the Permittee to enforcement
action by the Division of Water Quality, in accordance with North Carolina General Statute 143-215.6A to 143-
215.6C.
3. The issuance of this permit does not preclude the Permittee from complying with any and all statutes, rules,
regulations, or ordinances which may be imposed by other government agencies (local, state, and federal) which
have jurisdiction.
4. In the event that the facilities fail to perform satisfactorily, including the creation of nuisance conditions, the
Permittee shall take immediate corrective action, including those as may be required by this Division, such as the
construction of additional or replacement stormwater management systems.
5. The permittee grants DENR Staff permission to enter the property for the purpose of inspecting all components
of the permitted stormwater management facility.
6. The permit may be modified, revoked and reissued or terminated for cause. The filing of a request for a permit
modification, revocation and reissuance or termination does not stay any permit condition.
Permit issued this the 13th day of January, 1998.
NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION
C L � `�) l- t "/ u ( —
1 (D l:)— A. Preston Howard, Jr., P.E., Director
Division of Water Quality
By Authority of the Environmental Management Commission
Permit Number SW8 970936

State Stormwater Management Systems
Permit No. SW8 970936
Clear Water Place @Winding River Plantation
Stormwater Permit No. SW8 970936
Brunswick County
Engineer's Certification
I, , as a duly registered Professional Engineer in the State of North
Carolina, having been authorized to observe (periodically/weekly/full time) the construction of the project,
for (Project Owner) hereby state that, to the best of my abilities, due care and
diligence was used in the observation of the project construction such that the construction was observed to be built within
substantial compliance and intent of the approved plans and specifications.
Noted deviations from approved plans and specification:
SEAL
Signature
Registration Number
Date

i _ .
DIVISION OF WATER QUALITY
NORTH CAROLINA STORYIWATER YLANAGE`fENI' PERMIT .APPLICATION
I. GENERAL INFORMATION
(Please pnm dearly or rypu
1. Project Name CLEAR WATER PT ACF R WINDING RIVER PLANTATION
2. Location, directions to project (include County, Address, State Road) Attach map. BRUNSWICK COUNTY
.).Owner's Name John Sabitini Clear Water Place, Inc
4. Owner's Mailing Address P.O. Box 6059
.910-579-1375
City Smith Brunswick State N.C. Zip 28470
5. Nearest Receiving Stream Sandy Branch Class
6.Projectdescription Multi —Family Development
U. PERVUT INFORMATION
I. Permit No.rrobeslled;nlyowQ) i)8i7QC�'��j
C SW
2.Application Date _ Aualgt 29 1997 FeeenclosedS 385.00
3. Permit Type: x New Renewal Modification (existing Permit No.)
4. Project Type: _Low Density x Detention_Intiltration_Redevelop_General_ Alter_Offsite
5. Other State/Federal Permits/Approvals Required (Cwck appropriate blanks)
CAMA Major Sedimentation/Erosion Control x 404 Permit
III. BUILT UPON .AREA (Please see NCAC 2H. 1005 thru .1007 for applicable density limiv)
Classification
Existing Built -upon Area
Proposed Built -upon Area
Total Project Area
Built -upon Area
Drainage Drainage
Basin Basin
C SW
—0-
5.104 AC
8.85 Acres
57.7%
IV. STORAIWATER TREATMENT (Desenbe how the runoff will be rreared)
Breakdown of Impervious Area
(Please intricate below the design impervious area)
Buildings 2.057 AC
Sidewalk
Stfeets 0.26 AC
Parking/SW 2.263 AC
Pool/Tennis
Mler 0.524 AC
5.104 AC

V. DEED RESTRICTIONS .-VND PROTECTIVE COVENANTS
Deed restrictions and protective covenants are required to be recorded For all low density projects and all
subdivisions prior to the sale of any lot. Please see Attachment A for the specific items that must be recorded
for the type of project applied for.
By your signature below, you certify that the recorded deed restrictions and protective covenants for this project
shall include all the items required by the permit, that the covenants will be binding on all parries and persons
claiming under them, that they will run with the land, that the covenant cannot be changed or deleted without
concurrence from the State, and that they will be recorded prior to the sale of any lot.
VI. OWNER'S CERTIFICATION
h John sabitini=President certify that the information included on this permit
(Please prinr cieariy or type)
application form is correct, that the project will be constructed in conformance with the approved plans, that
the deed restrictions will be recorded with all required permit conditions, and that to the best of my knowledge,
the proposed project complies with the requirements of 15A NCAC 2H.1000.
I authorize the below nar�ed,,person or,irm to submit stormwater plans on my behalf.
gent Signature and Tide
VII. AGENT AUTHORIZATION (Ptease fill in the name of the engineer/surveyor authonzed to suhmir plans on the owner's behalf.)
Person or firm name Hnnston and Associates P A
Mailing Address P.O. Box 2927
Ciry Shallotte
State N.C. Zip 28459 Phone [phone]
Please submit application, fee, plans and calculations to the appropriate Regional Office.
cc: Applicant/WiRO//Central Files
ST

HOUSTON and ASSOCIATES, P.A.
Consulting Engineers
SHALLOTTE, NORTH CAROLINA 28459
Telephc�e [phone] 117 Pine Street
Facsimile [phone] Post Office Box 2927
MUMMERThursday, November 6, 1997
Ms. Linda Lewis, Environmental Engineer RECEIVED
Division of Environmental Management NOV 1 3 1997
North Carolina Department of Environment.
Health, and Natural Resources BY: q3
127 Cardinal Drive Extension
Wilmington, North Carolina 28405
Subject: Clear Water Place
Brunswick County, North Carolina
Resubmittal of Stormwater Plan
Dear Ms. Lewis:
In response to your letter dated November 4, 1997, we offer the following.
1. A typical unit footprint with dimensions and the wood stairs has been
enclosed.
2. Dimensions of the typical parking space, sidewalk, and parking lot
aisle have been added to the plans.
3. Calculations are based on a removal efficiency of 85%. A flow spreader
and vegetative filter with a minimum length of 50 feet has been added.
4. Wetlands are delineated on the plans.
5. The tennis courts are located in the amenity area and have been
labeled on the plans.
6. Only the delineated portion of the amenity area will be directed to the
stormwater pond. The amenity area has a total area of 5.49 acres and
the Master SW Plan allows a total impervious area of 3.50 acres. The
proposed amenity area will fall within the allowable impervious area;
however, we propose to collect funoff from the parking lot area and a
portion of the future tennis courts to avoid direct discharge into the
wetlands and to preserve and ensure water quality standards with an
engineered system.
7. In reference to the overall Master SW Plan for Winding River
Plantation, the. Clear Water project is delineated as Tract R with an
allowable impervious area of 5.10 acres. A revised overall stormwater
plan was submitted on October 15, 1997 including Clear Water Place.

Mrs. Lewis Page Two Clear Water Place
November 6, 1997 Stormwater Resubmittal
Enclosed are two copies each of the revised plans, calculations, and
typical building footprint.
We appreciate your attention in this matter. Should you have any
comments or require any additional information, please do not hesitate to
contact our office at your convenience.
Sincerely,
J toHouston, P.E.
snand
Associates,
P.A.
JRH/swq
Enclosures
pc: Mr. John Sabatini, Clear Water Place Inc.
File; 97-0137 (Clear Water Place, SW/EC)

Hydrologic and Hydraulic Calculations
for
Q
o J ° w(I)T Tang �o
BRUNSWICK COUNTY, NORTH CAROLEVA
\\ � 7 ryryrya
4'
ST®RMWATER
Prepared By
CONSULTING ENGINEERS
Shallotte, North Carolina
September 1997
Revised October 1997
E C E! V E
NOV 1 31997 D
p IP70(
PROJ

0
Clearwater Place
Drainage Basin Data
10/8/97
Prepared By: SWQ .
Checked By:
BASIN
IMPERVIOUS AREA
TOTAL
TOTAL
WEIGHTED
I.D.
PARKING
BUILDINGS
SIDEWALK
POOL/TENNIS
AREA
IMPERVIOUS
"C"
AC
AC
AC
AC
AC
AC
A
0.102
0.078
0.013
0.000
0.305
0.193
0.68
B
0.130
0.142
0.009
0.000
0.485
0.281
0.64
C
0.317
0.272
0.059
0.000
1.093
0.648
0.64
D
0.176
0.181
0.020
0.141
0.703
0.518
0.75
E
0.291
0.439
0.042
0.000
1.030
0.771
0.76
F
0.124
0.078
0.014
0.028
0.332
0.244
0.75
G
0.213
0.297
0.037
0.000
0.683
0.547
0.80
H
0.186
0.212
0.032
0.000
0.612
0.429
0.73
1
0.000
0.350
0.000
0.000
1.556
0.350
0.37
J
0.000
0.000
0.000
0.000
0.314
0.000
0.20
K
0.145
0.000
0.000
0.000
0.216
0.145
0.70
L
0.111
0.000
0.000
0.000
0.148
0.111
0.76
M
0.322
0.010
0.018
0.217
0.946
0.568
0.65
N
0.146
0.000
0.016
0.138
0.4253
0.300
0.73
Total:
2.263
2.057
0.260
0.524
8.847
5.103

Clearwater Place
Storm Drainage Flowrate Calculations
10/8/97
Prepared By: SWQ .
Checked By:
Storm Drain
I.D.
Contributing
Area
Drainage
Area
Impervious
Area
Weighted
"C"
Length
Slope
'Tc
i10
Q10
ac.
ac.
ft
ft/ft
min.
in/hr
cfs
SD11E;FG,H`,
2.66
1.99
0.76
623
0.005
4.25
7.0
14.17
SD2
E,F,G'l� '_
2.05
1.56
0.77
503
0.005
3.61
7.0
11.06
SD3
EFF -'-a
1.36
1.02
0.76
388
0.005
2.95
7.0
7.24
SD4
_",E
1.03
0.77
0.76
262
0.005
2.18
7.0
5.49
SD5
E
1.03
0.77
0.76
150
0.005
1.42
7.0
5.49
SD6
A,B,C,D,J,K,L,M,N
4.63
2.76
0.65
490
0.005
3.54
7.0
20.99
SD6A
A B CI D 9K}L MN
4.63
2.76
0.65
490
0.005
3.54
7.0
20.99
SD7
D M Nu Hv
2.07
1
0.70
360
0.005
2.79
7.0
10.17
.38
SD8
A,B
0.79
0.47
0.65
175
0.005
1.60
7.0
3.60
SD9
A
0.30
0.19
0.68
120
0.005
1.20
7.0
1.44
SD10
M,N
1.37
0.87
0.67
240
0.005
2.04
7.0
6.47
SD10A
M,N
1.37
0.87
0.67
200
0.005
1.77
7.0
6.47
SD11
N
0.43
0.30
0.73
140
0.005
1.35
7.0
2.17
SD12
J,K,L
0.68
0.26
0.48
265
0.005
2.20
7.0
2.29
SD13
K,L
0.36
0.26
0.73
185
0.005
1.67
7.0
1.85
SD14
L
0.15
0.11
0.76
120
0.005
1.20
7.0
0.79
`Tc multiplied
by 0.5 for flow over asphalt.

Clearwater Place
Storm Drainage Inverts
1 0/8/97 Prepared By: SWQ .
Checked By:
Storm Drain
Length
Inv. In
Inv. Out
Grate Elev.
Culvert Diam.
I.D.
Feet)
(msI)
(msI)
at Inv. In
Inches
SD1
100
16.50
16.00
22.50
24
SD2
120
17.10
16.50
23.50
24
SD3
115
19.81
1 19.24
25.10
18
SD4
126
20.44
19.81
JB
18
SD5
112
21.00
20.44
24.40
15
SD6
81
18.70
18.00
24.90 r,,
24
SD6A
71
18.00
16.50
JB
30
SD7
130
20.85
19.30
23.30
24
SD8
110
20.80
19.00
24.65
15
SD9
55
21.08
20.80
24.50
15
SD10
125
21.50
20.85
JB
18
SD10A
40
21.70
21.50
24.60
18
SD11
60
22.00
21.70
25.10
15
SD12
125
19.63
19.00
23.60
15
SD13
80
22.58
19.63
26.30
15
SD14
65
22.90
22.58
26.30
15
JB = Junction Box

Clearwater Place
Culvert Hydraulics
10/8/97
SD1
HEADWATER ELEVATION CALCULATIONS
FLOWRATE =
CFS
MANNINGS nDIA.
FOR CULVERT PIPE _
NINCHES
INCHES
DIA. FOR RISER =
LENGTH OF CULVERT PIPE = 1 00:
FEET
INV. IN ELEV. OF CULVERT = 16.501
FEET
INV. OUT ELEV. OF CULVERT = .1:6'.00!
FEET
INLET COEF. FOR CULV. PIPE FLOW - !,1 45
INLET COEF. FOR CULVERT INLET CONTROL ' 8
p
RISER WEIR ELEVATION= a 000
FEET
WEIR FLOW COEF. = LL s %0
TAILWATER ELEVATION = Pria2150FEET
VELOCITY= 4.51 FPS
SD2
ELEVATION CALCULATIONS
FLOWRATE=
CFS
MANNINGS n =
DIA. FOR CULVERT PIPE _
MINCHES
INCHES
DIA. FOR RISER =
LENGTH OF CULVERT PIPE =
1 20! FEET
INV. IN ELEV. OF CULVERT=
1.T.101 FEET
INV. OUT ELEV. OF CULVERT =
. 16.50P FEET
INLET COEF. FOR CULV. PIPE FLOW =
INLET COEF. FOR CULVERT INLET CONTROLRISER
WEIR ELEVATION=FEET
L7-
WEIR FLOW COEF. =
TAILWATER ELEVATION =
22.31 FEET
VELOCITY=
3.52 FPS
Prepared By: SWO .
Checked By:
HEADWATER ELEVATION ASSUMING INLET CONTROL]
HEAD = 0.88
HEADWATER ELEVATION = 18.38
HEADWATER ELEVATION ASSUMING PIPE FLOW
HEAD = 0.81
HEADWATER ELEVATION = 22.31
HEADWATER ELEVATION ASSUMING WEIR FLOW
HEAD = #DIV/01
HEADWATER ELEVATION = #DIV/0!
HEADWATER ELEVATION ASSUMING INLET CONTROLI
HEAD = 0.53
HEADWATER ELEVATION = 18.63
HEADWATER ELEVATION ASSUMING PIPE FLOW
HEAD = 0.53
HEADWATER ELEVATION = 22.84
HEADWATER ELEVATION ASSUMING WEIR FLOW
HEAD = #DIV/0!
HEADWATER ELEVATION = #DIV/0!

Clearwater Place
Culvert Hydraulics
10/8/97
ELEVATION CALCULATIONS
�FLOWRATE=
Y
CFS
MANNINGS n
1
DIA.FOR CULVERT PIPE =
15x18INCHES
DIA. FOR RISER =
#'; ` «0
INCHES
LENGTH OF CULVERT PIPE =
1 1'5!
FEET
INV. IN ELEV. OF CULVERT =
19.81
1 FEET
INV. OUT ELEV. OFCULVERT =
-...;::,1.9'.24!FEET
INLET COEF. FOR CULV. PIPE FLOW =
INLET COEF. FOR CULVERT
T ;7 5
INLET CONTROL
RISER WEIR ELEVATION=4 0'00
FEET
WEIR FLOW COEF.
n
TAILWATER ELEVATION =
22.84 FEET
VELOCITY= 4.10 FPS
SD4
HEADWATER ELEVATION CALCULATIONS
FLOWRATE=
� 5 49
CFS
MANNINGS n
DIA. FOR CULVERT PIPE _
'�,a, }+1 r8
INCHES
DIA. FOR RISER =
` 0
INCHES
LENGTH OF CULVERT PIPE =
1;26! FEET
INV. IN ELEV. OF CULVERT =
20.44� FEET
INV. OUT ELEV. OF CULVERT =
19.81.
INLET COEF. FOR CULV. PIPE FLOW =
tg 05
INLET COEF. FOR CULVERT INLET CONTROL
RISER WEIR ELEVATION
FEET
WEIR FLOW COEF. =
ratA
TAILWATER ELEVATION = 23.70 FEET
VELOCITY=
3.11 FPS
Prepared By: SWO
Checked By:
HEADWATER ELEVATION ASSUMING INLET
HEAD = 0.72
HEADWATER ELEVATION = 21.28
HEADWATER ELEVATION ASSUMING PIPE FLOW
HEAD = 0.86
HEADWATER ELEVATION = 23.70
HEADWATER ELEVATION ASSUMING WEIR FLOW
HEAD = #DIV/01
HEADWATER ELEVATION = #DIV/0!
HEADWATER ELEVATION ASSUMING INLET
HEAD = 0.42
HEADWATER ELEVATION = 21.61
HEADWATER ELEVATION ASSUMING PIPE FLOW
HEAD = 0.52
HEADWATER ELEVATION = 24.22
HEADWATER ELEVATION ASSUMING WEIR FLOW
HEAD =
#DIV/0!
#DIV/0!

Clearwater Place
Culvert Hydraulics
10/8/97
SD5
HEADWATER ELEVATION CALCULATIONS
FLOWRATE=i
5 49
CFS
MANNINGS n =
0 012
r4
DIA. FOR CULVERT PIPE =
`j
15
INCHES
DIA. FOR RISER
INCHES
LENGTH OF CULVERT PIPE=
112 FEEr
INV. IN ELEV. OF CULVERT=
21.00 FEET
INV. OUT ELEV. OFCULVERT =
20.44
FEET
INLET COEF. FOR CULV. PIPE FLOW =
yfi� 0x5
INLET COEF. FOR CULVERT INLET CONTROL
k 40,6
RISER WEIR ELEVATION =
0 00
FEET
WEIR FLOW COEF. _
` L
TAILWATER ELEVATION =
24.22 FEET
VELOCITY=
4.47 FPS
ELEVATION CALCULATIONS
=LOWRATE
CFS
✓1ANNINGS n =
-• �O.O�t2
CIA. FOR CULVERT PIPE _
; 2,4
INCHES
CIA. FOR RISER =
--,'r,..µ0.
INCHES
_ENGTHOFCULVERT PIPE=
81 FEET
NV. IN ELEV. OF CULVERT =
18.70 FEET
NV. OUT ELEV. OFCULVERT =
18.00 FEET
NLET COEF. FOR CULV. PIPE FLOW
NLETCOEF. FOR CULVERT INLET CONTROL
RISER WEIR ELEVATION
FEET
NEIR FLOW COEF. =
TAILWATER ELEVATION =
22.08 FEET
/ELOCITY=
6.68 FPS
Prepared By: SWO .
Checked By:
HEADWATER ELEVATION ASSUMING INLET
HEAD = 0.86
HEADWATER ELEVATION = 22.49
HEADWATER ELEVATION ASSUMING PIPE FLOW
HEAD= 1.16
HEADWATER ELEVATION = 25.37
HEADWATER ELEVATION ASSUMING WEIR FLOW
HEAD = #DIV/0!
HEADWATER ELEVATION = #DIV/0!
HEADWATER ELEVATION ASSUMING INLET
HEAD = 1.93
HEADWATER ELEVATION = 21.63
HEADWATER ELEVATION ASSUMING PIPE FLOW
HEAD = 1.63
HEADWATER ELEVATION = 23.72
HEADWATER ELEVATION ASSUMING WEIR FLOW
HEAD = #DIV/0!
HEADWATER ELEVATION = #DIV/0!

Clearwater Place
Culvert Hydraulics
10/8/97
ELEVATION CALCULATIONS
FLOWRATE=
7 720"99
CPS
MANNINGS n
DIA. FOR CULVERT PIPE
I,�� 3,0
INCHES
DIA FOR RISER =
c �. :�;;0.
INCHES
LENGTH OF CULVERT PIPE =
71
i FEET
INV. IN ELEV. OF CULVERT =
18.001
FEET
INV. OUT ELEV. OF CULVERT =
16! 501
FEET
INLET COEF. FOR CULV. PIPE FLOW0'15
INLET COEF. FOR CULVERT INLET CONTROL
RISER WEIR ELEVATION =
=<' `'Oa00
FEET
WEIR FLOW COEF.
TAILWATER ELEVATION
lii5"Ib
FEET
VELOCITY=
4.28 FPS
SD7
HEADWATER ELEVATION CALCULATIONS
FLOWRATE=
',;`'1.0:.1`9
CFS
MANNINGS n
DIA. FOR CULVERT PIPE =
5 ;..'+;.:� 24
INCHES
DIA. FOR RISER=[;w
0
INCHES
LENGTH OF CULVERT PIPE =
1'3 01
FEET
INV. IN ELEV. OF CULVERT =
20:85 FEET
INV. OUT ELEV. OF CULVERT =
19.30, FEET
INLET COEF. FOR CULV. PIPE FLOW =
„0.5
INLET COEF. FOR CULVERT INLET CONTROL' 0.'6
RISER WEIR ELEVATION=0
00
FEET
WEIR FLOW COEF. _'
*0'
TAILWATER ELEVATION =
23.72 FEET
VELOCITY=
3.24 FPS
Prepared By: SWO
Checked By:
HEADWATER ELEVATION ASSUMING INLET
HEAD = 0.79
HEADWATER ELEVATION = 20.04
HEADWATER ELEVATION ASSUMING PIPE FLOW
HEAD = 0.58
HEADWATER ELEVATION = 22.08
HEADWATER ELEVATION ASSUMING WEIR FLOW
HEAD = #DIV/0!
HEADWATER ELEVATION = #DIV/0!
HEADWATER ELEVATION ASSUMING INLET
HEAD = 0.45
HEADWATER ELEVATION = 22.30
HEADWATER ELEVATION ASSUMING PIPE FLOW
HEAD = 0.47
HEADWATER ELEVATION = 24.19
HEADWATER ELEVATION ASSUMING WEIR FLOW
HEAD = #DIV/0!
HEADWATER ELEVATION = #DIV/0!

ISD8
ELEVATION CALCULATIONS
Clearwater Place
Culvert Hydraulics
10/8/97
FLOWRATE _MINCHES
CFS
MANNINGS n =
DIA. FOR CULVERT PIPE _
INCHES
DIA. FOR RISER =
LENGTH OF CULVERT PIPE =
1101 FEET
.INV. IN ELEV. OF CULVERT =
20580' FEET
INV. OUT ELEV. OF CULVERT=
1900 FEET
INLET COEF. FOR CULV. PIPE FLOW =O:r5
INLET COEF. FOR CULVERT INLET CONTROL
yV
RISER WEIR ELEVATION =
106
00
FEET
„„0
WEIR FLOW COEF. _
TAILWATER ELEVATION =
23.72 FEET
VELOCITY=
2.93 FPS
SD9
HEADWATER ELEVATION CALCULATIONS
FLOWRATE='
Y+1"44
CPS
MANNINGS n =
% " Oc0:1.2
DIA. FOR CULVERT PIPE _
DIA. FOR RISER=
h
z, l ww`'3 ;115
1�;j r,,�""O:INCHES
INCHES
LENGTH OF CULVERT PIPE =
5'5: FEET
INV. IN ELEV. OF CULVERT =
21.08 FEET
INV. OUT ELEV. OF CULVERT =
20.80 FEET
INLET COEF. FOR CULV. PIPE FLOW =
INLET COEF. FOR CULVERT INLET CONTROLRISERWEIRELEVATION=
D-11
FEET
WEIR FLOW COEF. _
ELEVATION =
24.21 FEET
(TAILWATER
VELOCITY=
1.17 FPS
Prepared By: SWO .
Checked By:
HEADWATER ELEVATION ASSUMING INLET
HEAD = 0.37
HEADWATER ELEVATION = 21.80
HEADWATER ELEVATION ASSUMING PIPE FLOW
HEAD = 0.49
HEADWATER ELEVATION = 24.21
HEADWATER ELEVATION ASSUMING WEIR FLOW
HEAD= #DIV/0!
HEADWATER ELEVATION = #DIV/0!
HEADWATER ELEVATION ASSUMING INLET
HEAD = 0.06
HEADWATER ELEVATION = 21.76
HEADWATER ELEVATION ASSUMING PIPE FLOW
HEAD = 0.06
HEADWATER ELEVATION = 24.27
HEADWATER ELEVATION ASSUMING WEIR FLOW
HEAD = #DIV/01
HEADWATER ELEVATION = #DIV/01

SD10
TER ELEVATION CALCULATIONS
Clearwater Place
Culvert Hydraulics
10/8/97
FLOWRATE =
f6..;47
CPS
MANNINGS n =
I ` fr 0;12
DIA. FOR CULVERT PIPE _1
8
INCHES
DIA. FOR RISER =��
INCHES
LENGTH OF CULVERT PIPE =
12 5 FEET
INV. IN ELEV. OF CULVERT =
21.50FEET
INV. OUT ELEV. OF CULVERT =
20.85 FEET
INLET COEF. FOR CULV. PIPE FLOW =
Ot5
i
INLET COEF. FOR CULVERT INLET CONTROL
RISER WEIR ELEVATION =
000
FEET
WEIR FLOW COEF. =
k ,0
TAILWATER ELEVATION =
24.19 FEET
VELOCITY=
3.66 FPS
10A
ELEVATION CALCULATIONS
°LOWRATE=
'9(-2'•1S7
CPS
AANNINGS n =
0 �01:2
DIA. FOR CULVERT PIPE=
J ^ li"„rS.
t��``'
INCHES
DIA. FOR RISER=
I` � x. •!`� 0
INCHES
_ENGTH OF CULVERT PIPE=
40 FEET
NV. IN ELEV. OF CULVERT =
21 .70, FEET
NV. OUT ELEV. OF CULVERT =
21.50 FEET
NLET COEF. FOR CULV. PIPE FLOW
0.5
NLET COEF. FOR CULVERT INLET CONTROL 0.'6
RISER WEIR ELEVATION ='
° t0"00
FEET
NEIR FLOW COEF.=
0
TAILWATER ELEVATION =
24.90 FEET
/ELOCITY=
1.77 FPS
Prepared By: SWO .
Checked By:
HEADWATER ELEVATION ASSUMING INLET
HEAD = 0.58
HEADWATER ELEVATION = 22.83
HEADWATER ELEVATION ASSUMING PIPE FLOW
HEAD = 0.72
HEADWATER ELEVATION = 24.90
HEADWATER ELEVATION ASSUMING WEIR FLOW
HEAD = #DIV/0!
HEADWATER ELEVATION = #DIV/0!
HEADWATER ELEVATION ASSUMING INLET
HEAD = 0.13
HEADWATER ELEVATION = 22.46
HEADWATER ELEVATION ASSUMING PIPE FLOW
HEAD = 0.11
HEADWATER ELEVATION = 25.02
HEADWATER ELEVATION ASSUMING WEIR FLOW
HEAD = #DIV/0!
HEADWATER ELEVATION = #DIV/0!

Clearwater Place
Culvert Hydraulics
10/8/97
SD11
HEADWATER ELEVATION CALCULATIONS
FLOWRATE=
2 1r7 CFS
MANNINGS n =
DIA. FOR CULVERT PIPE=
1 5 INCHES
LJ�o
DIA. FOR RISER =
+''9'u0 INCHES
LENGTH OF CULVERT PIPE =
6 0' FEET
INV. IN ELEV. OF CULVERT =
22.00FEET
INV. OUT ELEV. OF CULVERT =
21.70, FEET
INLET COEF. FOR CULV. PIPE FLOW =
Or5
INLET COEF. FOR CULVERT INLET CONTROL= 0`.6
RISER WEIR ELEVATION =0
4, �a.
00 FEET
WEIR FLOW COEF. _0
TAILWATER ELEVATION =
25.02 FEET
VELOCITY=
1.77 FPS
iE
ELEVATION CALCULATIONS
Prepared By: SWO .
Checked By:
HEADWATER ELEVATION ASSUMING INLET CONTROL]
HEAD = 0.13
HEADWATER ELEVATION = 22.76
HEADWATER ELEVATION ASSUMING PIPE FLOW
HEAD = 0.13
HEADWATER ELEVATION = 25.15
HEADWATER ELEVATION ASSUMING WEIR FLOW
HEAD = #DIV/01
HEADWATER ELEVATION = #DIV/01
NRATE _
�' 2 29
CFS
WINGS n =
a �f 0a012
HEADWATER ELEVATION ASSUMING INLET CON'
FOR CULVERT PIPE =
4 �, �' ,�1 5
INCHES
FOR RISER
INCHES
HEAD= 0.15
3TH OF CULVERT PIPE =
125
FEET
HEADWATER ELEVATION = 20.40
IN ELEV. OF CULVERT =
19 63i FEET
OUT ELEV. OF CULVERT =
19.00 FEET
T COEF. FOR CULV. PIPE FLOW =
0:5
HEADWATER ELEVATION ASSUMING PIPE FLOW
T COEF. FOR CULVERT INLET CONTROL =+ ° 06
iR WEIR ELEVATION =
1, 000
FEET
HEAD = 0.22
9 FLOW COEF. =
b;`'-0
HEADWATER ELEVATION = 23.93
WATER ELEVATION =
23.72 FEET
JCITY=
1.87 FPS
HEADWATER ELEVATION ASSUMING WEIR FLOW
HEAD = #DIV/01
HEADWATER ELEVATION = #DIV/O!

Clearwater Place
Culvert Hydraulics
10/8/97
SD13
HEADWATER ELEVATION CALCULATIONS
FLOWRATE=
i� 1 85
CFS
MANNINGS n =
0 012
DIA. FOR CULVERT PIPE =
Y 1,5
INCHES
DIA. FOR RISER =
INCHES
LENGTH OF CULVERT PIPE =
8 0;
FEET
INV. IN ELEV. OF CULVERT =
22.56'
FEET
INV. OUT ELEV. OF CULVERT =
19"631
FEET
INLET COEF. FOR CULV. PIPE FLOW
INLET COEF. FOR CULVERT INLET CONTROL a Ou6
RISER WEIR ELEVATION =
'�'`' 000
FEET
WEIR FLOW COEF.
TAILWATERELEVATION=
23.93 FEET
VELOCITY=
1.51 FPS
SD14
ELEVATION CALCULATIONS
FLOWRATE=0i7.9
CFS
MANNINGS n
DIA. FOR CULVERT PIPE =
r y1,5
INCHES
DIA. FOR RISER =
' "' "' "' 0
INCHES
LENGTH OF CULVERT PIPE =
6 51 FEET
INV. IN ELEV. OF CULVERT
22.90 FEET
INV. OUT ELEV. OF CULVERT =
22.58� FEET
INLET COEF. FOR CULV. PIPE FLOW
INLET COEF. FOR CULVERT
INLET CONTROL
y4
RISER WEIR ELEVATION =
I 0 00
FEET
WEIR FLOW COEF. _
TAILWATER ELEVATION =
24.04 FEET
VELOCITY=
0.64 FPS
Prepared By: SWO
Checked By:
HEADWATER ELEVATION ASSUMING INLET
HEAD = 0.10
HEADWATER ELEVATION = 23.30
HEADWATER ELEVATION ASSUMING PIPE FLOW
HEAD = 0.11
HEADWATER ELEVATION = 24.04
HEADWATER ELEVATION ASSUMING WEIR FLOW
HEAD = #DIV/0!
HEADWATER ELEVATION = #DIV/0!
HEADWATER ELEVATION ASSUMING INLET
HEAD = 0.02
HEADWATER ELEVATION = 23.54
HEADWATER ELEVATION ASSUMING PIPE FLOW
HEAD = 0.02
HEADWATER ELEVATION = 24.06
HEADWATER ELEVATION ASSUMING WEIR FLOW
HEAD = #DIV/0!
HEADWATER ELEVATION = #DIV/0!

BASIN
I.D.
Flowrate
A
1.44
B
2.15
C
4.93
D
3.70
E
5.49
F
1.75
G
3.83
H
3.11
4.01
0.44
K
1.06
L
0.79
M
4.30
N
2.17
Clearwater Place
Grate Inlets
9/2/97
Inlet Grate Hydrology & Hydraulics
Check most critical catch basin. Inlet grate sized for most
critical basin will be suitable for all basins.
Most Critical Basin = Area P
10-Yr Flowrate: 5.49 cfs
Minimum Perimeter grate with head limited to 0.6 feet:
P = Q / (C'H)M.5 where C=2.5
Perimiter: 3.0 Feet
Minimum Open area of grate with head limited to 0.6 feet:
A = Q / C'(2'g'H)^0.5 where C=0.6
Open Area: 1 .5 g

Clearwater Place
Stormwatar Pond Design
8/27/97
Stormwater Pond Design
Total Drainage Area:
Impervious Area:
Buildings:
Parking:
Sidewalk:
Pool/Tennis Area:
Total:
% Imperivous:
§ 847 F
Acres
Acres
2"05'7
�
2:283 °
Acres
° ..
426,
Acres
0.524�
Acres
5.104
Acres
57.7 %
Permanent Pool Depth 8
% TSS Removal
SA/DA 2
Required SA: 9,634 SF
Runoff: Inches
"Simple Method"
R, 0.57
Volume: 18,280 CF
Actual Normal Pool SA:,"P '1'9;i50` SF (® 20.V MSL)
Depth of Storage: 1.0 Feet
USE: =�Feet
SA @ Storage Pool:
Provided Storage:
Pond Elevations:
Bottom Elev.:
Permanent Pool:
Storage Pool:
Flood Pool:
"Freeboard" Elev:
211,5�SF (@ 21.0' MSL)
20,335 CF
1?4� 0 � MSL
20.0 MSL
21.0 MSL
2.1`.5 MSL
22.0 MSL
Prepared By: SWC
Checked By:

�•�
_ S _
.. O
C
2 4
2 1
7
3 . 0
2— 7
5.=. > 90% TSS =gCti —
OR VET W=THOL=
/-
_J.
7
2.0
7.0
6.Li
5.7
7.2
of
gym.. I fir =
5

Clearwater Place
Stormwater Pond Design 9/2/97 Prepared By: SWQ .
Checked By:
aws:x-
Cleanlvater°Place`` x Runoff Hydrograph into SW Pond
The following Hydrograph Calculations are based on "Soil and Water Conservation
Engineering," Schwab,Frevert, Edminster, Barnes; Pages 93-115.
(See Flowrate Calc. and Drainage Basin Data for Breakdown of Areas)
Curve Number Draina a Area Land Use Soil Grou NA
%Fbi7fpervious B 499.8
' 8a1 3.7 c .:W. Grassed '� 4_, B, -1, 228.14
Total: 8.84 Total: 727.94
Weighted Curve Number: 82.35
Runoff Volume: (Soil Conservation Service Method)
Storm Duration: 10 Yr 1'Mr
Storm Rainfall: 2.8 Inches
S: 2.14
Direct Surface Runoff: 1.25 Inches
Total Runoff: 39,961 CF
0.92 Ac-Ft
Peak Flowrate:
10 Yr Intensity: 1�Inches/Hour
Weighted "C": 0.63
10 Yr Peak Flowrate: 39.15 CFS
Basic Hydrograph:
Conversion Factors:
u: 0.000278 Ac-Ft/Unit
w: 0.39151 CFS/Unit
k: 0.516 Min/Unit

Clearwater Place
Stormwater Pond Design
8/27/97 Prepared By: SWQ .
Checked By:
Time Min Flow CFS
0.0 0.0
1.5 2.0
3.6 5.9
5.2 13.7
6.7 21.9
8.2 30.1
9.3 35.2
10.3 38.0
11.9 39.2
13.9 37.6
15.5 33.3
17.5 28.2
20.6 19.6
24.2 12.9
27.3 9.4
30.9 6.3
34.5 4.3
43.3 1.6
51.6 0.0
Inflow Hydrograph
40.0 -
35.0
30.0
LL 25.0
U
20.0
i
2 15.0
LL
10.0
I
5.0
0.0
0.0
10.0 20.0 30.0 40.0 50.0 60.0
i
Time (MIN)
i
i

Clearwater Place
Stormwater Pond Design
8/27/97 Prepared By: SWQ
Checked By:
Clearwater Place
Pond Stage -Discharge -Storage
Pond Storage Area = 19,150.00 Square Feet
AT = �01'2�0 sec.
ELEVATION DISCHARGE STORAGE 2S/DT + O
20.00 0.00 0.00
21.00 0.00 19150 319
21.12 1.00 21448 358
21.34 5.00 25661 433
21.43 7.00 27385 463
21.54 10.00 29491 502
21.86 15.00 35619 609
22.74 17.00 52471 892
24.38 20.00 83877 1418
" Discharge / Stage Relationship Based on 18" Barrel and 24" Riser
1600 -
Outflow vs MAT + O
i
1400
i
I
1200
1000
O
I I I
800
(n
I N
I I II I I
I I I I i
600
i
I I I I I
I
I
I
�
400
I
I
�
I
I
I
I I I
I
200
lie
y0
I I I I 1 I
I
O
I
0 5 10
Outflow (CFS)
15 20 1

Clearwater Place
Stormwater Pond Design
8/27/97 Prepared By: SWQ .
Checked By:
Clearwater. Place
Routing Table.- SW Treatment Pond
AT USED IN STAGE-DISCHARGESTORAGE
2 (min)
Time n In In + In+1 2S/DT - On 2S/DT + On+1 On+1
(min) (CFS) (CFS) (CFS) (CFS) (CFS)
0, 1 0'- 2
2 2 2, 8 2 2 0. •;
4 3 6 27 10 10 0
6 4 ;2,1. 51 37 37
8 5 30 68 88 88 0
10 6 38' 77 156 156,,« �0 `
12 7 3977 233 233' �0
14 8 38: 72 310 310 � 0
16 9 34' 62 378 382 2
18 10 28, 47 430 440 � 5
20 11 19 34 461 477 "BP
22 12 15 27 475 495 1=0
24 13 12. 23 482 502
26 14 11 20 485 505 10
28 15 9 16 485 505a10
30 16 7 12 481' 501 10
32 17 5 9 473 493 0
34 18 4 7 466 482 Sa xe
36 19 3 6 459 473 7
xw�
38 20 35 451 465
40 21 2 4 444 456 6
42 22 2' 3 436 4486�
44 23 1 2 429 4395
46 24 1. 2 421 431� 5
48 25 1` 1 413 423_r5y °¢
50 26 0 0 406 414 P4

Clearwater Place
Stormwater Pond Design
8/27/97
Stormwater Pond Outlet Structure
HEADWATER ELEVATION CALCULATIONS
FLOW RATE =
bj
CFS
F1
MANNINGS n =
0.012
DIA. FOR CULVERT PIPE =
18
INCHES
DIA. FOR RISER =
24
INCHES
LENGTH OF CULVERT PIPE =
1 1 0
FEET
INV. IN ELEV. OF CULVERT =
18.00
FEET
INV. OUT ELEV. OF CULVERT =
17.00
FEET
INLET COEF. FOR CULV. PIPE FLOW =
0.5
INLET COEF. FOR CULVERT INLET CONTROL = .0.6
RISER WEIR ELEVATION =
21.00
FEET
WEIR FLOW COEF. =
1 4
TAILWATER ELEVATION =
18.00
FEET
010 Routed Flowrate equals 10 cfs
Prepared By: SWO
ulluumuu
HEADWATER ELEVATION ASSUMING INLET CONTROL
HEAD = 1.38
HEADWATER ELEVATION = 20.13
HEADWATER ELEVATION ASSUMING PIPE FLOW
HEAD = 1.60
HEADWATER ELEVATION = 19.60
HEADWATER ELEVATION ASSUMING WEIR FLOW
HEAD = 0.54
HEADWATER ELEVATION = 21.54

Clearwater Place
Drawdown Calculations
8/27/97
Clearwater Place
Stormwater Pond Drawdown
ORIFICE DIA.
INCHES
AREAS (FTA2)
NUMBER OF ORIFICES
1 2 3
4
INWig 211 0.034 0.068 0.102 0.1361
DATAINPUT
NORMALPOOLAREA=
INCHES OF RAINFALL =
BASIN AREA =
IMPERVIOUS AREA =
NORMAL POOL ELEVATION =
ORIFICE AREA =
STORAGE POOL AREA=
TIME INCREMENT OF ROUTING =
ORIFICE COEF. =
INPUT RESULTS
RUNOFF COEF. (Rv) =
ELEVATION OF POOL AT STORAGE _
NORMALPOOLAREA=
VOLUME OF RUNOFF FROM RAINFALL =
VOLUME OF STORAGE =
0.440'ACRES
W'°WR INCHES
8.85iACRES
5.10'ACRES
20'.ob FEET
�v 5 0 034 FEE 2
0:4940'ACRES
�' 2; I HOURS
�. 0 '6
0.5692
2.1.00 FEET
19,150.00 FEETZ
18,280.50 FEET3
20,335.00 FEET3
Prepared By: SWC .
Checked By:

T
Clearwater Place
Drawdown Calculations
8/27/97 Prepared By: SWO .
Checked By:
Drawdown Calculations
For Pond
Orfice
TIME
ELEVATION
HEAD
FLOWRATE
VOLUME
END
ELEV.
FEET
FEET
CFS
CIF
FEET
0
21.00
1.0000
0.16371
1,178.71
20.94
2.0
20.94
0.9384
0.15859
1,141.85
20.88
4.0
20.88
0.8788
0.15347
1,104.98
20.82
6.0
20.82
0.8211
0.14835
1,068.09
20.77
8.0
20.77
0.7653
0.14322
1,031.18
20.71
10.0
20.71
0.7115
0.13809
994.24
20.66
12.0
20.66
0.6596
0.13296
957.28
20.61
14.0
20.61
0.6096
0.12782
920.29
20.56
16.0
20.56
0.5615
0.12268
883.27
20.52
18.0
20.52
0.5154
0.11753
846.22
20.47
20.0
20.47
0.4712
0.11238
809.13
20.43
22.0
20.43
0.4290
0.10722
772.00
20.39
24.0
20.39
0.3887
0.10206
734.83
20.35
26.0
20.35
0.3503
0.09689
697.61
20.31
28.0
20.31
0.3139
0.09171
660.34
20.28
30.0
20.28
0.2794
0.08653
623.01
20.25
32.0
20.25
0.2468
0.08134
585.61
20.22
34.0
20.22
0.2163
0.07613
548.14
20.19
36.0
20.19
0.1876
0.07091
510.58
20.16
38.0
20.16
0.1610
0.06568
472.91
20.14
40.0
20.14
0.1363
0.06043
435.13
20.11
42.0
20.11
0.1136
0.05517
397.20
20.09
44.0
20.09
0.0928
0.04987
359.10
20.07
46.0
20.07
0.0741
0.04455
320.78
20.06
48.0
20.06
0.0573
0.03919
282.18
20.04
50.0
20.04
0.0426
0.03378
243.21
20.03
52.0
20.03
0.0299
0.02830
203.73
20.02
54.0
20.02
0.0192
0.02271
163.48
20.01
56.0
20.01
0.0107
0.01693
121.92
20.00
58.0
20.00
0.0043
0.01078
77.59
20.00
60.0
20.00
0.0003
0.00275
#REF!
#REF!
Tim�n�e
ODrawdown
c1 eze

12
I
6 = b7
�ts/INiRiv /✓fl/SaU a�N >n/NN d7�/
-'7n7)lrCrD fVOIJ--W Na w/Q_)5 aN� NO/jyu:R "b 90'$ t;
Sal'?/,./ gi = -L nQ
;dam
/./OlLaatovd 1a'7tnp cw 5?1 'D'�1H/7% 41./710155
aL
o'

State of North Carolina
Department of Environment
and Natural Resources
Wilmington Regional Office
James B. Hunt, Jr., Governor
Wayne McDevitt, Secretary
Division of Water Quality
November 4. 1997
Mr. Jay Houston, P.E.
Houston and Associates
PO Box 2927
Shallotte, NC 28459
-ANT4
NC®ENR
NORTH C.AROLINA DEPARTMENT OF
ENVIRONMENT ANo NATURAL RESOURCES
Subject: ACKNOWLEDGEMENT OF RECEIPT AND
REQUEST FOR ADDITIONAL INFORMATION
Stormwater Project No. SW8 970936
Clearwater Place @Winding River ��
Brunswick County 1 'Ic-
Dear Mr. Houston:
The Wilmington Regional Office received a Stormwater Management Permit Application for
Clearwater Place @Winding River on September 26, 1997. A preliminary review of that information has
determined that the application is not complete. The following information is needed to continue the
stormwater review:
1. Provide typical unit footprints with dimensions, and wood/concrete areas noted.
2. Provide parking lot aisle, space, and sidewalk dimensions.
3. The calculations report a removal efficiency of 80%. I believe this should be 90%. Please
remember that if you use the 85 % SA/DA number, you MUST provide a vegetated filter at
the outlet.
4. Delineate all wetlands on site, or note on the plans that none exist.
5. Label the location of the tennis courts referred to on the plans.
6. Will the future amenity area be routed to this pond? Portions of the area are already delineated
within the drainage area of this pond.
7. In reference to the overall map, what is the tract number and allowable impervious area for
this project, as approved in the Master Plan?
127 North Cardinal Dr., Wilmington, North Carolina 28405 Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer 50 % recycled/10% post -consumer paper

Mr. Houston
November 4, 1997
Stormwater Project No. SW8 970936
Please note that this request for additional information is in response to a preliminary review. The
requested information should be received by this Office prior to December 4, 1997, or the application will
be returned as incomplete. The return of a project will necessitate resubmittal of all required items, including
the application fee.
If you have any questions concerning this matter please feel free to call me at [phone].
Sincerely,
Ms. Linda Lewis
Environmental Engineer
RSS/arl: S:\WQS\STORMWAT\ADDINFO\970936.NOV
cc: Linda Lewis
Central Files
127 North Cardinal Dr., Wilmington, North Carolina 28405 Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer 2 50% recycled/10% post -consumer paper

HOUSTON and ASSOCIATES, P.A.
Consulting Engineers
SHALLOTTE, NORTH CAROLINA 28459
Telephone [phone]
Facsimile [phone]
Ms. Linda Lewis, Environmental Engineer
Division of Environmental Management
North Carolina Department of Environment,
Health, and Natural Resources
127 Cardinal Drive Extension
Wilmington, North Carolina 28405
117 Pine Street
Post Office Box 2927
Wednesday, September 24, 1997
Subject: Clear Water Place
Brunswick County, North Carolina
Submittal of Stormwater Plan for Approval
Dear Ms. Lewis:
n F-'' c a-+'e ''✓ 1✓D
SEp 2 i; 1'.?97
B"'' �8
On behalf of Clear Water Place, Inc., we are pleased to submit for your
review and approval two copies each of the Stormwater Plans, the hydrologic
and hydraulic calculations and the executed Permit Application forms.
The proposed subject project falls within the high density guidelines.
Enclosed is a check in the amount of $385.00 to cover the required high
density application fee.
We appreciate your attention in this matter. Should you have any
comments or require any additional information, please do not hesitate to
contact our office at vour convenience.
Sincerely,
J WoAs
n, P.E.
s on andsociat P.A.
JRH/swq
Enclosures
pc: Mr. John Sabatini, Clear Water Place Inc. \ ,
File: 97-0137 (Clear Water Place, SW/EC) J�